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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88f384252fe9bf348dedf3aaa29bc0d4dc86d481de5fc2efa4ecb6a8ff85eb8' 
  AND token = 'LAtWaSa+eYwiQT+iDYz1ya3HRqqJ8NjO4TeyTDJulZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}